Important SCIENCE (CHEMISTRY )

 

✔️Important SCIENCE (CHEMISTRY )


✅. Gases used in welding are ? 

– Acetylene & Oxygen 


✅ Gases used by sea divers for breathing are ?

 – Oxygen & Helium

 

✅. Best sources for Vitamin D are? 

– Sunlight & Fish liver 


✅Zinc Phosphide is used as?

 – Rat Poison 


✅. Fuse wire is made up of  

– Lead and Tin 


✅Purest form of Iron is?

 – Wrought Iron 


✅ Radium is extracted from  . 

– Pitchblende 


✅ Which agent is as ‘seed’ in artificial rain?

 – Silver Iodide 


✅. Oxides of metals are  . 

– Alkaline 


✅ During the process of ‘rusting’ , the weight of iron  . 

–Increases 


✅ (metal) is liquid at room temperature. 

– Mercury


✅ What is the formula of common salt 

– NaCl 


✅. What is the maximum number of electrons that a p-orbital can hold 

– 6 


✅. What is used in fire extinguisher 

– Sodium bicarbonate 


✅ What is the nature of metal oxides 

– Basic 


✅. Which gas burns with popping sound 

– Hydrogen  


✅ Which metal is used for galvanization 

– Zinc 


✅. What is the nature of bleaching powder 

– Oxidising agent 


✅ Which is stored in Kerosene 

– Sodium 


✅ Phenolphthalein gives which color in acidic medium 

– Colorless 


✅ Which gas is used in cigarette lighters? 

– Butane 


✅. Biogas chiefly contains  .

 – Methane 


✅. Chemical used as fixer in Photography is  .

 – Sodium thiosulphate


✅Aspirin is   

– Acetyl Salicylic Acid 


✅ is also known as ‘Stranger Gas.’

 – Xenon 


✅ Natural rubber is a polymer derived from .

 – Isoprene